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Java Cheat Sheet
Print-ready cheat sheet for Java, organized for fast lookup, study, and desk-side use
Sample
What's in this cheat sheet
- Basics
- Data Types
- Control Flow
- Methods
- Classes & Objects
- Inheritance
- Interfaces
- Collections
- Exception Handling
- Streams & Lambdas
- Generics
- Optional & Modern Java
Hello World
public class Main {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
Compile & Run
javac Main.java # compile
java Main # run
java Main.java # single-file (Java 11+)
Naming Conventions
ClassName | PascalCase for classes and interfaces |
methodName | camelCase for methods and variables |
CONSTANT_NAME | UPPER_SNAKE for constants |
com.example.pkg | Lowercase reverse domain for packages |
Download the full cheat sheet for all sections, formatted for print
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